Predicting bed expansion and phase holdups for three-phase fluidized-bed reactors with and without biofilm

Haibo Yu, Bruce Rittmann

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

A predictive model is developed for the hydraulic behavior, such as bad height and overall gas, liquid, and solid holdups (volume fractions), of three-phase fluidized-bed reactors. The model uses process parameters, such as reactor dimensions, particle properties, and gas and liquid flowrates, as input variables. A wake model is applied to predict the liquid holdup, while the solids holdup is obtained by iteration based on material balance. Experimental results to evaluate the three-phase fluidization model are obtained from a laboratory-scale reactor using two sizes of clean glass beads under wide range of gas and liquid velocities. Modeling predictions and experimental results agree quantitatively for two-phase and three-phase conditions. The model is further applied to analyze fluidized beds with biofilm-coated media. Biofilm accumulation alters the drag coefficient (C(D)) and bed expansion index (n). Applying a modified correlation for C(D) to biofilm systems found in literature, the authors propose a new correlation for n which shows little dependence on the particle terminal Reynolds number.

Original languageEnglish (US)
Pages (from-to)2604-2616
Number of pages13
JournalWater Research
Volume31
Issue number10
DOIs
StatePublished - Oct 1997
Externally publishedYes

Fingerprint

Biofilms
Fluidized beds
biofilm
liquid
Liquids
Gases
gas
fluidization
drag coefficient
Drag coefficient
Fluidization
Reynolds number
Volume fraction
glass
Hydraulics
reactor
hydraulics
Glass
prediction
modeling

Keywords

  • Biofilm reactors
  • Fluidized bed
  • Hydrodynamics
  • Modeling
  • Phase holdup
  • Three-phase
  • Wake theory

ASJC Scopus subject areas

  • Earth-Surface Processes

Cite this

Predicting bed expansion and phase holdups for three-phase fluidized-bed reactors with and without biofilm. / Yu, Haibo; Rittmann, Bruce.

In: Water Research, Vol. 31, No. 10, 10.1997, p. 2604-2616.

Research output: Contribution to journalArticle

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